Bas specializes in civil and public law. He advises in particular on disputes between contractors and clients, arbitration, construction defects, procurement disputes, architectural law, neighbourhood law and spatial administrative law.
- Since graduating from the University of Amsterdam, Bas has practised as an attorney in Amsterdam. Before moving to Wintertaling, he was a partner with Lexence.
- From 2002 to 2014, Bas was a member of the Board of Amsterdam Oost district council, during the last year of which he was also chairman of his political party group. During his board membership he was member of the Committee for Housing and Large Projects.
- Bas has completed the post-graduate Environmental Law programme of the Grotius Academy.